TREA

Shozo Ishiyama

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  • Tokyo, JP
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Patents Grantslast 30 patents

  • Information Patent Grant

    Jigsaw puzzle toy using blocks
    • Patent number 5,190,287
    • Issue date Mar 2, 1993
    • Kabushiki Kaisha Gakushu Kenkyusha
    • Shozo Ishiyama
    • A63 - SPORTS GAMES AMUSEMENTS
  • Information Patent Grant

    Children's block toy
    • Patent number 4,667,962
    • Issue date May 26, 1987
    • Kabushiki Kaisha Gakushu Kenkyusha
    • Shozo Ishiyama
    • G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
  • Information Patent Grant

    Numeral adding toy
    • Patent number 4,368,381
    • Issue date Jan 11, 1983
    • Kabushiki Kaisha Gakushu Kenkyusha (Gakken Co., Ltd.)
    • Shozo Ishiyama
    • G06 - COMPUTING CALCULATING COUNTING
  • Information Patent Grant

    Clock for educational purposes
    • Patent number 4,273,541
    • Issue date Jun 16, 1981
    • Gakken Co., Ltd
    • Shozo Ishiyama
    • G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
  • Information Patent Grant

    Multiplication study device
    • Patent number 4,258,477
    • Issue date Mar 31, 1981
    • Gakken Co., Ltd
    • Shozo Ishiyama
    • G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS